JP4241478B2 - Fluid filled anti-vibration connecting rod - Google Patents

Description

  The present invention relates to an anti-vibration connecting rod as an anti-vibration coupling body such as a torque rod for anti-vibration connection of an internal combustion engine to a support frame, and in particular, based on the flow action of an incompressible fluid enclosed therein. The present invention relates to a fluid-filled vibration-proof connecting rod that is effective.

  Conventionally, anti-vibration connecting rods are employed as various links, rods, arms, etc. that are interposed between two members such as a torque rod and a suspension link in an automobile and connect them with anti-vibration. In such an anti-vibration connecting rod, in order to firmly connect two members while suppressing vibration transmission, generally, a rubber bush is assembled to the end of a hard rod body, and the end of the rod body is It can be attached to each member via a rubber bush. However, it may be difficult to obtain a sufficient anti-vibration effect to satisfy the required characteristics only by the elastic deformation action of the rubber elastic body constituting the rubber bush.

  Therefore, as described in Patent Document 1 (Japanese Utility Model Laid-Open No. 61-120602), it is conceivable that the rod body has a fluid sealing structure including a cylinder mechanism. However, if the cylinder mechanism is formed on the rod body, the structure of the rod body becomes extremely complicated, and the rod body becomes larger and heavier.

  Further, as described in Patent Document 2 (Japanese Patent Laid-Open No. 5-24440), a rubber bushing assembled to the end of the rod body is used as a fluid sealing structure, so that the resonance action of the fluid that is caused to flow at the time of vibration input, etc. It is also conceivable to obtain a vibration isolation effect based on the fluid action. However, in order to ensure a sufficient fluid flow rate to exhibit an effective vibration-proofing effect, the enclosing region of the incompressible fluid is made sufficiently large, or the length of the orifice passage that forms the fluid flow path If the design freedom of the area is to be secured, it is inevitable that the rubber bush will become large. Therefore, it is practically used in the vibration proof connecting rod for automobiles where the installation space is limited. There was a problem that it was difficult.

  Further, Patent Literature 3 (Japanese Utility Model Publication No. Sho 60-155609), Patent Literature 4 (Japanese Utility Model Publication No. 2-44120), and Patent Literature 5 (Japanese Patent Publication No. 6-29637) disclose a rubber bush having a fluid-filled structure. Have been proposed in which two are attached to both ends of the vibration-proof connecting rod, a connecting rod having a hollow tube structure is employed, and a hollow hole of the tube constituting the connecting rod is used as an orifice passage.

  However, in the connecting rod having such a conventional structure, the volume of the fluid chamber needs to be secured inside the rubber bush, so that the size of the rubber bush becomes large in order to secure the volume of the sealed fluid. In addition, since it is necessary to assemble fluid-filled rubber bushes each having a fluid chamber in which positive and negative are opposite and pressure fluctuations of the same magnitude are generated at both ends of the rod body when vibration is input. In addition to being greatly restricted in the degree of freedom of design of the bushing itself, there is a case where the size of the whole connecting rod becomes a problem by installing a fluid-filled rubber bush at both ends of the connecting rod.

Japanese Utility Model Publication No. 61-120602 Japanese Patent Laid-Open No. 5-24440 Japanese Utility Model Publication No. 60-155609 Japanese Utility Model Publication 2-44120 Japanese Patent Publication No. 6-29637

  Here, the present invention has been made in the background as described above, and the problem to be solved is to form a fluid flow path in which the fluid enclosed inside can flow with a large degree of freedom. Accordingly, an object of the present invention is to provide a fluid-filled vibration-isolating connecting rod having an improved structure in which an anti-vibration effect based on a fluid flow action can be effectively exerted.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

That is, according to the present invention, rubber bushes are assembled to both end portions in the longitudinal direction of the rod body, and the both end portions of the rod body are attached to one member to be vibration-proof connected via the rubber bushes. In addition, a fluid chamber in which an incompressible fluid is sealed is formed with respect to a rubber bush assembled to at least one end of the rod body. In a fluid-filled vibration-proofing connecting rod that exhibits a vibration-proofing effect based on a fluid action, a part of the wall portion is made of a flexible film located in the middle portion of the rod body in the longitudinal direction. Forming an equilibrium chamber in which volume change is allowed, filling the equilibrium chamber with the incompressible fluid, and forming an orifice passage for communicating the equilibrium chamber with the fluid chamber. To, and, a fluid-filled vibration damping connecting rod which is adapted at least a portion of said orifice passage is formed by utilizing the space inside the rod body, characterized.

  In the vibration-isolating connecting rod having the structure according to the present invention as described above, an equilibrium chamber is formed at a position different from the rubber bush, at an intermediate portion in the longitudinal direction of the rod body. At the time of vibration input, fluid flow through the orifice passage is generated between the equilibrium chamber and the fluid chamber formed inside the rubber bush, and based on the fluid action such as resonance action of the fluid. The anti-vibration effect will be exhibited.

  Therefore, according to the present invention, the equilibration chamber in which the incompressible fluid is accommodated and the orifice passage for communicating the equilibration chamber with the fluid chamber formed in the rubber bush efficiently use the space on the rod body. As a result, it is possible to advantageously secure the enclosed volume of the incompressible fluid including the equilibrium chamber while suppressing the increase in size of the rubber bushing itself, and to increase the amount of fluid flow at the time of vibration input. The accompanying vibration isolation effect can be improved.

  Moreover, in the present invention, the orifice passage for communicating the fluid chamber and the equilibrium chamber is also formed at least partially using the space on the rod body, so that the size of the rubber bush itself and the complexity of the structure are increased. There is also an advantage that a large degree of freedom in designing the passage length and cross-sectional area of the orifice passage can be ensured without increasing the degree of freedom, and that the degree of freedom in tuning the vibration isolation characteristics can be improved.

  In the present invention, preferably, the equilibration chamber is formed with a recess or a through hole in an intermediate portion in the longitudinal direction of the rod body, and the opening of the recess or the through hole is fluidized by the flexible membrane. It is formed by densely covering the lid. With such a configuration, the target equilibrium chamber can be easily formed while sufficiently ensuring the design freedom of the size, position, and shape of the equilibrium chamber.

  Furthermore, in the present invention, for example, the orifice passage extends from the fluid chamber of the rubber bush to the inside of the rod body, and in the vicinity of the tip of the orifice passage that extends from the fluid chamber, the rod body An aspect in which the equilibrium chamber is formed by forming a through hole penetrating the peripheral wall portion of the orifice passage constituted by the above and covering the through hole with the flexible film is also suitably employed. With such a configuration, the rod main body can be used to advantageously form an orifice passage therein, and an equilibrium chamber can be easily formed with a large volume on the outer peripheral side thereof.

  In the present invention, it is preferable that the rod main body is formed of divided structures that are overlapped with each other in a direction substantially orthogonal to the longitudinal direction of the rod main body at least in an intermediate portion in the longitudinal direction. A configuration in which the equilibrium chamber and the orifice passage are formed between the overlapping surfaces in the divided structure is preferably employed. With such a configuration, not only the equilibrium chamber but also the orifice passage can be easily formed with a simple structure while sufficiently securing the design freedom of the form.

  Further, when forming the equilibrium chamber and the orifice passage with such a divided structure, a seal rubber layer is formed on the overlapping surface of at least one of the divided structures, and the seal rubber layer is overlapped with the divided structure. A configuration in which the equilibrium chamber and the orifice passage are sealed fluid-tight with respect to the external space by clamping between the mating surfaces can be suitably employed.

  In the present invention, for example, the rubber bushing has a mounting hole such as an arm eye formed on the longitudinal end of the rod body, and a separately vulcanized bushing body is fitted into the mounting hole by press fitting or the like. In addition to forming a rubber bush by assembling to the rod body, for example, by vulcanizing and molding a rubber elastic body that forms a rubber bush in a mounting hole provided at the end of the rod body, the rod body at the same time as molding A rubber bush may be formed by vulcanization bonding. In particular, when assembling a separately formed bush body into the mounting hole of the rod body, for example, a split structure that forms an equilibrium chamber or an orifice passage between the overlapping surfaces as described above is extended to the end of the rod body. It is desirable to extend and form the mounting hole for assembling the rubber bush in cooperation with these divided structures. As a result, for example, when the bush body formed by vulcanizing and bonding the inner shaft member and the mounting cylinder member, which are spaced apart from each other in the radial direction, with the rubber elastic body of the main body is assembled to the mounting hole of the rod body, By inserting the cylindrical member between both divided structures and incorporating them, a locking mechanism that prevents the mounting cylindrical member from coming off from the rod body in the axial direction between the mounting cylindrical member and the divided structural body can be easily obtained. It becomes possible to form. Such a locking mechanism, for example, prevents an axial pull-out by providing a locking projection on the split structure of the rod body that is overlapped and locked with the axial end surface of the mounting member of the rubber bush. By disengaging the engagement concave portion provided in the middle portion in the axial direction of the mounting cylinder member in the mechanism or the rubber bushing from the outer peripheral surface in the split structure, the axial protrusion is prevented. It can be advantageously realized by a mechanism or the like.

  In the present invention, preferably, the orifice passage is formed to extend inside the rod body with a non-linear shape such as a curve or a bend. Thus, by forming the fluid flow path with a non-linear shape, the length of the orifice passage can be secured more advantageously within the limited range of the length of the connecting rod, As a result, the degree of freedom in designing the fluid flow path, and thus the degree of freedom in tuning the vibration isolation characteristics, can be further improved. A non-linear orifice passage that is curved or bent can be easily formed, for example, by configuring the rod body with a divided structure as described above.

  In the present invention, in the case where the rod body is constituted by the divided structure as described above, the entire axial length of the rod body is formed by the divided structure, and the rubber is respectively provided at both ends in the longitudinal direction of the rod body. It is also possible to adopt a configuration in which the cylindrical portion to which the bush is assembled is cooperatively formed with the divided structure. In this way, by forming the divided structures with a length that extends over the entire length of the rod body in the axial direction, the strength and rigidity of the rod body can be advantageously ensured in cooperation with the divided structures.

  By the way, the above-described divided structure that is preferably employed in the present invention and constitutes the connecting rod can be formed by various combinations of metal and metal, resin and resin, metal and resin, and the like. Also, as a fixed structure that holds a pair of divided structures fixedly in an overlapped state, for example, by using bolts or rivets or the like, if the divided structure is a metal, it is caulked, welded, brazed, press-fitted Etc. can be suitably employed, and in the case of resin, resin can be welded or bonded.

  Therefore, preferably, at least one of the divided structures is configured by a press-molded metal member, and the concave grooves extending by opening in the overlapping surface of the divided structures are formed by pressing. Is adopted. In this embodiment, even an equilibrium chamber and an orifice passage of any and various complicated shapes and sizes can be easily formed with high accuracy with excellent mass productivity by pressing.

  As is clear from the above description, in the connecting rod having the structure according to the present invention, the space on the rod body is used to form an equilibrium chamber at a position different from that of the rubber bush. The amount of incompressible fluid enclosed can be advantageously secured while improving the degree of freedom in designing the orifice passage, thereby achieving a compact size and excellent vibration-proof performance. It is possible to achieve both.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described.

  First, the concrete form of the torque rod for motor vehicles which is an anti-vibration connection rod as one Embodiment of this invention is shown by FIGS. The torque rod 10 has a first rubber bush 14 assembled on one side in the longitudinal direction and a second rubber bush 16 assembled on the other longitudinal side of the longitudinal rod body 12. It has been. The first rubber bush 14 is attached to a power unit of an automobile (not shown), while the second rubber bush 16 is attached to a vehicle body of an automobile (not shown) so that the first rubber bush 14 is attached between the power unit and the vehicle body. The torque reaction force of the power unit is bufferedly transmitted to the vehicle body while suppressing vibration transmission from the vehicle body to the vehicle body.

  More specifically, the rod main body 12 has the upper divided plate metal fitting 18 and the lower divided plate metal fitting 20 which are substantially the same in shape over each other, and are stacked and fixed to each other in the plate thickness direction. It is a divided structure. As shown in FIG. 2, a plan view of the upper and lower divided metal plates 18 and 20 in the assembled state is shown in FIG. 2, and longitudinal sectional views before the assembly are shown in FIGS. 5 and 6. In any case, the whole has a substantially constant thin plate shape, and has a substantially longitudinal flat plate shape as a whole. Each of the divided plate members 18 and 20 has the second rubber bush 16 attached from one side in the longitudinal direction (the right side in FIGS. 1, 2, 5 and 6) on which the first rubber bush 14 is attached. The plate width dimension is gradually reduced toward the other side in the longitudinal direction.

  The upper and lower divided metal plates 18 and 20 have circular large-diameter openings 22 and 24 formed at corresponding positions near one end portion in the longitudinal direction, and near the other end portion in the longitudinal direction. Circular small-diameter openings 26 and 27 are formed at positions corresponding to each other. Furthermore, substantially rectangular central opening windows 28 and 29 are formed in the upper and lower divided plate fittings 18 and 20 at positions corresponding to substantially central portions in the longitudinal direction.

  Furthermore, the upper and lower divided metal plates 18 and 20 span between the large-diameter opening portions 22 and 24 and the peripheral edge portions where the central opening windows 28 and 29 face each other at positions corresponding to the center portions in the width direction. Thus, upper and lower concave grooves 30 and 31 extending substantially linearly in the longitudinal direction of the respective divided plate metal members 18 and 20 are formed so as to open in the overlapping surface. Then, the large-diameter openings 22 and 24 and the central opening windows 28 and 29 in the upper and lower divided metal plates 18 and 20 are connected to each other by the concave grooves 30 and 31.

  Further, the upper divided plate member 18 is integrally formed with a first upper divided cylindrical portion 32 projecting at a predetermined height upward from the inner peripheral edge of the large-diameter opening 22, and a small-diameter opening. A second upper divided cylindrical portion 33 that protrudes at a predetermined height upward from the inner peripheral edge of 26 is integrally formed. Further, an annular upper locking portion 34 that projects radially inward is integrally formed on the peripheral edge of the upper end opening of the first upper divided cylindrical portion 32. Furthermore, the upper divided plate member 18 is integrally formed with a central upper cylindrical portion 35 protruding upward at a predetermined height from the inner peripheral edge of the central opening window 28.

  On the other hand, the lower divided plate member 20 is integrally formed with a first lower divided cylindrical portion 36 protruding downward from the inner peripheral edge of the large-diameter opening 24 at a predetermined height, A second lower divided cylindrical portion 38 that protrudes downward from the inner peripheral edge of the small-diameter opening 27 at a predetermined height is integrally formed. In addition, an annular lower locking portion 40 that protrudes radially inward is integrally formed on the peripheral edge of the lower end opening of the first lower divided cylindrical portion 36. Furthermore, the lower divided plate member 20 is integrally formed with a central lower cylindrical portion 42 that protrudes downward from the inner peripheral edge of the central opening window 29 at a predetermined height.

  In addition, a rib-like fitting peripheral wall portion 44 continuously extending over the entire circumference is provided on the outer peripheral edge portion of the lower divided metal plate 20 on the overlapping surface side (upward) of the upper divided metal plate 18. It protrudes toward the bottom and is integrally formed. Further, a caulking piece 46 that protrudes further upward at a plurality of locations on the circumference is integrally formed at the protruding tip portion of the fitting peripheral wall portion 44.

  Here, the upper and lower divided plate fittings 18 and 20 having the above-described structure are formed by punching a metal plate such as stainless steel having a flat plate shape into an appropriate shape, and by pressing the upper and lower first and second divided plates. The cylindrical portions 32, 33, 36, 38, the upper and lower central cylindrical portions 35, 42, and the upper and lower concave grooves 30, 31 are press-molded, and further fitted to the outer peripheral edge portion of the lower divided plate metal fitting 20. The peripheral wall portion 44 and the caulking piece 46 can be advantageously formed by press molding. In particular, by forming the upper and lower divided metal brackets 18 and 20 with such press fittings, the rod body 12 can be formed thin and compact while ensuring sufficient strength and dimensional accuracy. Excellent mass productivity can be realized. In addition, the upper and lower central cylindrical portions 35 can be set in addition to the size of the upper and lower first and second divided cylindrical portions 32, 33, 36, and 38 being arbitrarily set. 42 and the shape of the upper and lower concave grooves 30, 31 and the positions to be formed are set with various degrees of freedom and can be easily formed.

  In addition, upper and lower adherend rubber elastic bodies 48 and 50 are fixed to the upper and lower divided metal plates 18 and 20 by vulcanization molding.

  The upper adherent rubber elastic body 48 integrally vulcanized and bonded to the upper divided plate metal member 18 includes: (a) a thin lower surface seal layer 52 that covers the entire lower surface of the upper divided plate metal member 18 with a substantially constant thickness; (B) a thin inner peripheral sealing layer 54 that covers substantially the entire inner peripheral surface of the first upper divided cylindrical portion 32; and (c) an inner peripheral surface of the second upper divided cylindrical portion 33. A fitting rubber layer 56 covering substantially the entire surface, and (d) an elasticity that covers the opening of the central upper cylindrical portion 35 in a fluid-tight manner by attaching the outer peripheral edge to the central upper cylindrical portion 35. The upper diaphragm 58 having a slack as an easily deformable flexible film is integrally formed. The upper adherend rubber elastic body 48 is vulcanized and bonded to the upper divided plate fitting 18 simultaneously with molding by setting the upper divided plate fitting 18 in the molding cavity of the vulcanization mold and performing vulcanization molding. Yes.

  Further, the lower adherend rubber elastic body 50 integrally vulcanized and bonded to the lower divided metal plate 20 is (a ′) a thin wall covering the upper surface of the lower divided metal plate 20 with a substantially constant thickness over substantially the entire surface. (B ′) a thin inner peripheral sealing layer 64 covering substantially the entire inner peripheral surface of the first lower divided cylindrical portion 36, and (c ′) an outer cylindrical portion. With respect to the inner cylinder fitting 65 as an inner shaft member formed on the inner peripheral surface of the second lower divided cylindrical portion 38 and inserted and arranged in the second lower divided cylindrical portion 38. Thus, the inner peripheral surface is vulcanized and bonded to elastically connect the inner cylindrical metal fitting 65 to the second divided cylindrical portion 38 to substantially form the second rubber bush 16. And (d ′) the outer peripheral edge portion is attached to the central lower cylindrical portion 42, whereby the opening of the central lower cylindrical portion 42 is fluid-tight. And a lower diaphragm 67 having a slack as the elastic deformation easily flexible film for covering, comprise are integrally molded. The lower adherend rubber elastic body 50 is vulcanized in the same manner as the upper adherend rubber elastic body 48.

  The upper and lower divided metal plates 18 and 20 to which the upper and lower adherend rubber elastic bodies 48 and 50 are bonded by vulcanization are formed in the thickness direction over the entire surface thereof as shown in FIGS. They are stacked one above the other and secured to each other, thereby forming an integral rod body 12. At the time of such superposition, the outer peripheral edge portion of the upper divided plate metal fitting 18 is fitted to the fitting peripheral wall portion 44 of the lower divided plate metal fitting 20 and is relatively aligned in the surface direction, and the lower divided metal plate 20 is aligned. The upper and lower divided metal plates 18 and 20 are fixed so as not to be separated by press caulking pieces 46 of the metal plate 20 and being locked to the outer peripheral edge of the upper divided metal plate 18.

  The rod main body 12 formed in this manner is uniaxially orthogonal to the overlapping surface of the upper and lower divided plate members 18 and 20 in cooperation with the first upper and lower divided cylindrical portions 32 and 36. A large-diameter cylindrical first outer cylinder portion 68 is formed as an outer cylinder member extending in the vertical direction, and the upper and lower divided plate brackets 18 are cooperated by the second upper and lower divided cylindrical portions 33 and 38. , 20 is formed as a second outer cylinder portion 69 having a small diameter cylindrical shape as an outer cylinder member extending on one axis orthogonal to the overlapping surface.

  Further, the inner cylindrical metal fitting elastically connected to the second lower divided cylindrical portion 38 of the lower divided metal plate 20 via the main rubber elastic body 66 by overlapping the upper and lower divided metal plate metals 18 and 20. 65 penetrates the second upper divided cylindrical portion 33 of the upper divided plate metal member 18 and protrudes upward. Further, the inner cylindrical metal fitting 65 protruded upward from the lower divided metal fitting 20 has a second upper metal plate 18 with respect to the outer peripheral surface of the main rubber elastic body 66 attached to the outer peripheral surface. The fitting rubber layer 56 attached to the upper divided cylindrical portion 33 is externally fitted in a close contact state. Accordingly, the inner cylinder fitting 65 is elastically connected to the second outer cylinder part 69 via the main rubber elastic body 66 and the fitting rubber layer 56 at the end in the longitudinal direction of the rod main body 12. Thus, a second rubber bush 16 is formed.

  Furthermore, when the upper and lower divided plate members 18 and 20 are overlapped and fixed, the bush main body 70 constituting the first rubber bush 14 is set between the overlapping surfaces.

  As shown in FIGS. 7 and 8, the bush main body 70 is spaced a predetermined distance radially outward from the inner cylinder fitting 72 having a thick and small-diameter cylindrical shape as an inner shaft member. An intermediate sleeve 74 as a mounting cylinder member having a thin-walled large-diameter cylindrical shape is disposed on substantially the same central axis, and substantially between the radially opposing surfaces of the inner cylinder fitting 72 and the intermediate sleeve 74 as a whole. A main rubber elastic body 76 having a thick cylindrical shape is interposed, and an inner cylinder fitting 72 and an intermediate sleeve 74 are vulcanized and bonded to the inner and outer peripheral surfaces of the main rubber elastic body 76, respectively. Is formed.

  The main rubber elastic body 76 is formed with a slit 78 penetrating in the axial direction so as to be located on one side of the inner cylinder 72 in the direction perpendicular to the axis and extending in the circumferential direction with a predetermined length of half or less. On the other hand, on the other side in the direction perpendicular to the axis across the inner cylindrical metal fitting 72, a pocket portion 79 that is located in the middle portion in the axial direction and opens to the outer peripheral surface has a predetermined length of not more than a half circumference in the circumferential direction. It is formed to spread. Further, the intermediate sleeve 74 is formed with a window portion 80 at a position corresponding to the opening portion of the pocket portion 79, and the pocket portion 79 is opened to the outer peripheral surface of the bush body 70 through the window portion 80. Yes. In the pocket portion 79, an elastic stopper portion 82 that protrudes from the center of the bottom surface toward the opening portion at a predetermined height is integrally formed by the main rubber elastic body 76.

  The bush main body 70 is positioned in the upper and lower large-diameter openings 22 and 24 in the upper and lower divided plate fittings 18 and 20, and the upper and lower divided plate fittings 18 and 20 are overlapped so that An intermediate sleeve 74 is fitted into the first divided cylindrical portions 32 and 36 through the inner peripheral seal layers 54 and 64 in a press-fitted state. Thereby, the bush main body 70 is fixedly assembled to the first outer cylinder portion 68 with the intermediate sleeve 74 fitted fluid-tightly to the first outer cylinder portion 68. .

  Further, under the assembled state of the bush main body 70 with respect to the rod main body 12, the bush main body 70 is rotated around its central axis so that the opposing direction of the slit 78 and the pocket portion 79 of the bush main body 70 is the longitudinal direction of the rod main body 12. Aligned with the rod body 12 in the direction. Further, the window portion 80 in which the pocket portion 79 is opened is positioned to open toward the second outer cylinder portion 69 in the longitudinal direction of the rod body 12.

  Furthermore, the bush main body 70 is assembled to the rod main body 12, and the intermediate sleeve 74 of the bush main body 70 is fluid-tightly fitted and fixed to the first outer cylinder portion 68 via the inner peripheral seal layers 54 and 64. Accordingly, a fluid chamber 84 is formed in the pocket portion 79 of the bush main body 70 so as to be fluid-tightly partitioned from the external space and filled with an incompressible fluid. In addition, water, polyalkylene glycol, silicone oil, etc. can be suitably employ | adopted as an incompressible fluid enclosed. Moreover, the incompressible fluid can be easily sealed by, for example, assembling the upper and lower divided plate fittings 18 and 20 with the bush body 70 interposed therebetween in the incompressible fluid.

  Further, the upper and lower central openings 28 and 29 are overlapped with each other by overlapping the upper and lower divided metal plates 18 and 20, and thereby the upper and lower diaphragms 58 and 67 constitute a part of the wall portion. Thus, an equilibrium chamber 86 is formed that is fluid-tightly partitioned from the external space and in which an incompressible fluid is sealed.

  Further, the upper and lower recessed grooves 30 and 31 are overlapped with each other by overlapping the upper and lower divided metal plates 18 and 20, thereby forming a peripheral wall portion with the upper and lower recessed grooves 30 and 31, and externally. An orifice passage 88 is formed as a fluid passage that is fluid-tightly partitioned from the space and extends between the overlapping surfaces of the upper and lower divided plate members 18 and 20. In particular, in the present embodiment, the orifice passage 88 is formed so as to linearly extend in the longitudinal direction at the central portion in the width direction of the rod body 12. The orifice passage 88 allows the fluid chamber 84 and the equilibrium chamber 86 of the first rubber bush 14 to communicate with each other.

  It should be noted that the above-described equilibrium chamber 86 and orifice passage 88 are filled with the incompressible fluid by combining the bush main body 70 by combining the upper and lower divided metal plates 18 and 20 in the incompressible fluid as described above. It can be done simultaneously with filling the chamber 84 with the incompressible fluid.

  In addition, between the overlapping surfaces of the upper and lower divided metal plates 18 and 20 that are stacked and assembled with each other, the upper and lower seal layers 52 and 62 are formed over substantially the entire surface by the caulking fixing force of the plural caulking pieces 46. Thus, they are overlapped in close contact with each other and held under pressure. As a result, the fluid tightness of the fluid chamber 84, the equilibrium chamber 86, and the orifice passage 88 is highly secured.

  Note that the protruding front end surface of the elastic stopper portion 82 protruding from the pocket portion 79 of the bush body 70 is larger on both sides in the circumferential direction than the opening portion of the orifice passage 88 to the fluid chamber 84, and this elastic stopper. When the portion 82 is brought into contact with the first outer cylinder 68, the longitudinal direction of the rod body 12 in the inner cylinder 72 of the first rubber bush 14 and the inner cylinder 65 of the second rubber bush 16 is achieved. The relative amount of displacement toward the approach side is limited in a buffering manner so that a non-linear spring characteristic is exhibited. In particular, the elastic stopper portion 82 covers the opening portion of the orifice passage 88 to the fluid chamber 84 when abutting against the first outer cylinder portion 68. An effective stopper function is exhibited.

  Further, as is clear from the above description, in the present embodiment, in the middle portion in the longitudinal direction of the rod main body 12 constituted by the upper and lower divided plate fittings 18 and 20, the inner portions of the upper and lower central cylindrical portions 35 and 42 are included. A through hole is formed by the hole, and both the openings of the upper and lower central cylindrical portions 35 and 42 serving as the through holes are covered fluid-tightly by the diaphragms 58 and 67 serving as the flexible films, whereby the equilibrium chamber 86 is formed. Is formed. Alternatively, the orifice passage 88 extends from the fluid chamber 84 of the first rubber bush 14 to the inside of the rod body 12, and near the tip of the orifice passage 88 extending from the fluid chamber 84, the rod It can also be understood that the through hole penetrating the peripheral wall portion of the orifice passage 88 formed by the main body 12 is formed by the inner holes of the upper and lower central cylindrical portions 35 and 42. It can also be understood that the equilibrium chamber 86 is formed by covering the inner holes of the upper and lower central cylindrical portions 35 and 42 as holes with upper and lower diaphragms 58 and 67 as flexible films.

  Thus, in the torque rod 10 having the above-described structure, the rod is placed between the inner cylinder fitting 72 and the inner cylinder fitting 65 of the first and second rubber bushes 14 and 16 in the mounted state. When vibration in the longitudinal direction of the main body 12 is exerted, an anti-vibration effect based on elastic deformation of the main rubber elastic bodies 66 and 76 in the first and second rubber bushes 14 and 16 is exhibited. In addition, in the first rubber bush 14, pressure fluctuation is induced in the fluid chamber 84 based on the elastic deformation of the main rubber elastic body 76, and the relative pressure between the fluid chamber 84 and the equilibrium chamber 86 is increased. A fluid flow through the orifice passage 88 is generated between the two chambers 84 and 86 based on the pressure fluctuation. As a result, an anti-vibration effect based on a fluid action such as a resonance action of the fluid that is caused to flow through the orifice passage 88 is exhibited.

  Here, in the torque rod 10, since the orifice passage 88 is formed so as to extend inside the rod body 12 between the overlapping surfaces of the upper and lower divided plate members 18, 20, the first rubber bushing is formed. It is possible to set the passage sectional area and the passage length of the orifice passage 88 sufficiently large without increasing the size of the orifice 14 itself, and a large degree of freedom in designing the orifice passage 88 can be secured. In particular, since the rod body 12 has a divided structure composed of upper and lower divided plate members 18 and 20, the degree of freedom in designing the orifice passage 88 can be increased even when a rod body having a tubular structure having a conventional structure is employed. It can be greatly improved.

  Further, in the present embodiment, the equilibrium chamber 86 in which the pressure fluctuation relative to the fluid chamber 84 of the first rubber bush 14 is generated is formed at a position away from the first rubber bush 14 inside the rod body 12. Thus, the volume of the equilibrium chamber 86 can be secured sufficiently large while avoiding the increase in size of the first rubber bush 14, thereby allowing the enclosed fluid and thus the orifice passage 88 to flow. By sufficiently securing the flow amount of the incompressible fluid, it becomes possible to obtain a vibration isolation effect based on the fluid flow action more advantageously.

  In addition, in the present embodiment, when the bush body 70 constituting the first rubber bush 14 is assembled to the upper and lower divided plate fittings 18 and 20, the intermediate sleeve 74 is attached to the upper and lower divided cylindrical portions 32 and 36. Just by engaging and locking both axial end faces to the upper and lower locking portions 34, 40, sufficient anti-drilling resistance and fluid tightness in the axial direction can be obtained without obtaining a special metal-to-metal press-fitting process. It can be easily and quickly assembled while ensuring.

  In particular, in the present embodiment, the first outer cylinder portion that is cooperatively formed by the upper and lower divided structures 18 and 20 has the upper and lower first structures having cylindrical shapes respectively formed on the divided structures 18 and 20. By dividing the cylindrical portions 32 and 36 in the axial direction, a split structure is formed in the axial direction, so that the bush body 70 has an outer peripheral surface at both end portions in the axial direction of the intermediate sleeve 74. Thus, the upper and lower first divided tubular bodies can be firmly fitted and fixed over the entire circumference continuously in the circumferential direction. Therefore, the orifice passage 88 extending outward from the opening portion of the pocket portion 79 is formed in the upper and lower divided structures 18 while ensuring a high fluid tightness of the pocket portion 79 formed in the outer peripheral surface of the bush body 70. , 20 can be easily formed between the overlapping surfaces.

  In the present embodiment, the second rubber bushing 16 is formed substantially simultaneously with the vulcanization molding of the lower adherend rubber elastic body 50 (main rubber elastic body 66) with respect to the lower divided plate metal fitting 20. Since it is assembled to the rod body 12, its manufacture is further facilitated.

  Further, in the present embodiment, in the equilibrium chamber 86, both axial sides of the peripheral wall portion constituted by the upper and lower central cylindrical portions 35 and 42 are constituted by the diaphragms 58 and 67, so that the equilibrium chamber of a small size is obtained. Even in the case 86, a large volume variable amount can be secured by the two diaphragms 58 and 67, and there is also an advantage that the fluid flow amount between the fluid chamber 84 through the orifice passage 88 can be secured very advantageously.

  In the present embodiment, the upper and lower divided plate fittings 18 and 20 are both formed of a press-formed product, and the upper and lower divided plate fittings 18 and 20 are also fixed to each other by caulking and fixing. Therefore, the target torque rod 10 can be efficiently manufactured at a low cost by skillfully using a press device or press working.

  Further, as described above, in the rod body 12, the upper and lower seal layers 52 and 62 formed for the purpose of ensuring fluid tightness between the overlapping surfaces of the upper and lower divided metal fittings 18 and 20 are held with pressure. In particular, in the present embodiment, the rubber layer composed of the seal layers 52 and 62 is interposed between the overlapping surfaces of the upper and lower divided plate members 18 and 20 in a sandwiched state. Therefore, the rod body 12 functions as if it were a vibration-damping steel plate, and the effect that the transmission of vibration and the deterioration of vibration transmission due to the resonance of the rod body 12 can be suppressed more advantageously is exhibited. The

  Hereinafter, several torque rods according to another embodiment of the present invention will be shown, but the members and parts having the same structure as the first embodiment described above are respectively shown in the drawings in the first embodiment. Detailed description thereof will be omitted by attaching the same reference numerals.

  First, the torque rod 100 as the second embodiment shown in FIGS. 9 to 10 shows another aspect of the second rubber bushing 16 as compared with the first embodiment.

  That is, in the torque rod 100 of the present embodiment, the upper divided plate fitting 18 is shorter than the lower divided plate fitting 20 on one end side in the longitudinal direction (the narrow side located on the left side in the drawing). In the rod main body 12, the end on this side is substantially constituted only by the lower divided metal plate 20.

  Further, the lower divided plate metal member 20 is integrally formed with an outer tube portion 102 having a cylindrical shape by being bent and folded at one end portion in the above-described longitudinal direction which forms the rod body 12 substantially independently. Has been. Note that the portion of the lower divided metal plate 20 that is folded and overlapped is fixed by welding, brazing, or the like.

  And the 2nd rubber bush 16 is formed and assembled | attached using this outer cylinder part 102. As shown in FIG. Here, the second rubber bush 16 has a main rubber elastic body 106 with respect to the inner cylinder fitting 104 as an inner shaft member in which the outer cylinder portion 102 is inserted and arranged at a predetermined distance on the inner peripheral side thereof. It is comprised by being elastically connected by. The second rubber bushing 16 is formed by vulcanizing and molding the main rubber elastic body 106 between the outer cylindrical portion 102 and the inner cylindrical metal fitting 104 inserted and disposed in the outer cylindrical portion 102. 106 is vulcanized and bonded to the inner cylinder fitting 104 and the outer cylinder portion 102. For example, an integral vulcanization molded product obtained by vulcanizing and bonding the main rubber elastic body 106 to the outer peripheral surface of the inner cylinder fitting 104 is separately provided. It may be formed by assembling it to the outer cylinder portion 102 of the lower divided plate metal fitting 20 by press fitting or the like.

  In the torque rod 100 having such a structure, the same effects as those of the first embodiment described above can be exhibited. Further, the central axis of the second rubber bush 16 is formed in the width direction along the plate surface of the lower divided metal plate 20, and the directions of the central axes of the first rubber bush 14 and the second rubber bush 16 are set. They can be shifted approximately 90 degrees from each other. Thereby, it becomes possible to cope with the difference in the direction of the central axis of the rod, bolt, or the like at the mounting portion of the torque rod 100 in the power unit and the vehicle body.

  Next, the torque rod 110 as the third embodiment shown in FIGS. 11 to 12 is divided into upper and lower divided metal fittings (18, 20) as compared with the first embodiment. The aspect which employ | adopted the metal fittings 112 and 114 is shown.

  That is, in the torque rod 110 of this embodiment, die-cast metal fittings are adopted as the upper and lower divided metal fittings 112 and 114. In particular, a die-cast metal fitting made of an aluminum alloy that is lighter and easier to form than cast iron or the like is preferably used.

  The upper and lower divided metal fittings 112 and 114 can be fixed to each other by, for example, welding or brazing. However, as shown in the drawing, a plurality of fixing pins 116 are integrally formed in the lower divided metal fitting 114. On the other hand, a plurality of fixing holes 118 are formed at corresponding positions of the upper divided metal fitting 112, and each fixing pin 116 is press-fitted and fixed to each fixing hole 118, or each fixing pin 116 is fixed to each fixing hole 118. For example, it can be advantageously performed by inserting the wire into the wire and caulking the tip.

  Further, in the present embodiment, the upper divided metal fitting 112 is a first upper divided metal piece that is assembled with the bush body 70 to form the first rubber bushing 14, similarly to the upper divided metal fitting (18) of the first embodiment. A cylindrical portion 32, an upper concave groove 30 that extends in the longitudinal direction from the first upper divided cylindrical portion 32 to form an orifice passage 88, and an upper end that is connected to the extended tip portion of the upper concave groove 30. The central upper cylindrical portion 35 that forms the equilibrium chamber 86 by being covered with the diaphragm 58 is respectively provided. On the other hand, the lower divided metal fitting 114 is the lower divided metal fitting (20 of the first embodiment). ), The first lower divided cylindrical portion 36 that forms the first outer cylindrical portion 68 in cooperation with the first upper divided cylindrical portion 32 of the upper divided metal fitting 112, There is no lower groove 31 or central lower cylindrical part 42 And one lower split tubular portion 36 the longitudinal direction of the intermediate portion ranging between second lower split tubular portion 38, has a substantially flat overlapping surface over its entire surface. However, such a flat overlapping surface of the lower divided metal fitting 114 is also overlapped with the upper divided metal fitting 112 to cover the downward opening in the upper concave groove 30 and the central upper cylindrical portion 35 in a fluid-tight manner. Accordingly, a volume-variable equilibrium chamber 86 having a part of the wall portion formed of the upper diaphragm 58 is formed in the longitudinal intermediate portion of the rod body 12 and the equilibrium chamber 86 and the fluid chamber 84 are communicated with each other. The orifice passage 88 can be effectively formed.

  And in such torque rod 110 of this embodiment, the same effects as those of the first embodiment can be effectively exhibited with respect to the vibration isolation effect based on the fluid flow action, in addition to that, By adopting the upper and lower divided metal fittings 112 and 114 made of die-cast metal fittings, the rod body 12 can be mass-produced particularly with high strength and high rigidity.

  The specific shapes of the upper and lower divided metal fittings 112 and 114 are basically configured as a thick block structure as shown in the figure, and are basically configured in a plate state with a predetermined thickness, and at necessary locations. Needless to say, a shape in which protrusions or the like as reinforcing ribs are integrally formed can be appropriately employed.

  In addition, as the upper and lower divided metal fittings 112 and 114, for example, those formed by injection molding or the like using a synthetic resin material reinforced with fiber as necessary can be used instead. And further improvement in mass production.

  Next, in the torque rod 120 as the fourth embodiment shown in FIGS. 13 to 14, the first rubber bush 14 and the second rubber bush 16 are formed as separate structures, and the rod main body 12 includes the rod body 12. The first and second divided tubular fittings 122 and 124 are connected to each other in the axial direction.

  That is, in the present embodiment, the first outer cylinder portion (68) in the first embodiment that is externally fitted and fixed to the bushing body 70 to form the first rubber bush 14 has a large-diameter cylindrical shape. It is composed of one outer tube fitting 126, and is fitted on the inner sleeve 74 of the bushing body 70 and fluidized tightly through the inner peripheral seal layer 128 by being drawn as required. It is worn. Further, the second outer cylinder portion (69) in the first embodiment, which forms the second rubber bush 16, is constituted by a second outer cylinder fitting 130 having a small diameter cylindrical shape, and an inner cylinder fitting. The main rubber elastic body 132 is vulcanized and molded between the inner cylinder fitting 65 and the second outer cylinder fitting 130.

  On the other hand, each of the first and second divided tube fittings 122 and 124 has a hollow tube structure such as a circular cross-section, and is second than the inner and outer diameter dimensions of the first divided tube fitting 122. The inner and outer diameter dimensions of the divided cylindrical fitting 124 are increased by a predetermined amount. And the 1st division | segmentation cylinder metal fitting 122 is weld-fixed with respect to the outer peripheral surface of the 1st outer cylinder metal fitting 126 of the 1st rubber bush 14 in the axial one opening edge part, It protrudes from the rubber bush 14 in the direction perpendicular to the axis. The second divided cylindrical fitting 124 is welded and fixed to the outer peripheral surface of the second outer cylindrical fitting 130 of the second rubber bush 16 at one opening end portion in the axial direction thereof. It protrudes from the rubber bush 16 in the direction perpendicular to the axis.

  Further, the first outer cylinder fitting 126 of the first rubber bush 14 is provided with a communication hole 134 at a position that covers the pocket portion 79 and constitutes the outer peripheral wall portion of the fluid chamber 84. And the one end surface of the axial direction of the 1st division | segmentation cylinder metal fitting 122 is piled up and welded with respect to the formation part of the communication hole 134 in the 1st outer cylinder metal fitting 126, Thereby, the 1st division | segmentation cylinder The central hole 136 of the metal fitting 122 is communicated with the fluid chamber 84 through the communication hole 134 in one axial direction.

  On the other hand, one end surface in the axial direction of the second divided tube fitting 124 is overlapped and welded to the outer peripheral surface of the second outer tube fitting 130 of the second rubber bush 16. One end in the axial direction of the center hole 138 of 124 is fluid-tightly closed by the second outer cylinder fitting 130. In addition, a through hole 140 is formed in the middle portion in the axial direction of the second divided tube fitting 124 so as to extend through the tube wall portion inward and outward at an appropriate number of locations on the circumference. Further, a cylindrical diaphragm 144 made of a thin rubber cylinder having a slack such as a bellows shape is externally inserted into the second divided cylindrical metal part 124 so as to cover a portion where the through hole 140 is formed. Has been. Then, both end portions in the axial direction of the cylindrical diaphragm 144 are located on both side portions in the axial direction sandwiching the formation portion of the through-hole 140 with respect to the outer peripheral surface of the second divided cylindrical metal fitting 124 using the fastening belt 146 or the like. It is fixed fluid-tight over the entire circumference. Thereby, between the second split cylindrical metal fitting 124 and the cylindrical diaphragm 144, a volume change can be easily allowed based on the deformation of the cylindrical diaphragm 144, and an annular incompressible fluid is sealed inside. An equilibration chamber 148 is formed, and the equilibration chamber 148 is connected to the center hole 138 of the second divided cylindrical fitting 124 through the through hole 140.

  Further, the other end portion in the axial direction of the second divided cylindrical metal fitting 124 is a fitting cylindrical portion 150 having an inner diameter dimension slightly increased over a predetermined length in the axial direction. The other end in the axial direction of the first divided tube fitting 122 is press-fitted into the fitting tube portion 150 and is fixed in a fluid-tight manner.

  As a result, the first divided tube fitting 122 and the second divided tube fitting 124 are connected and fixed to each other on the same central axis, so that the rod body 12 having a substantially hollow circular rod shape as a whole is configured. Has been.

  Further, the center hole 136 of the first divided tube fitting 122 and the center hole 138 of the second divided tube fitting 124 are connected in series to each other at each end, whereby the first rubber bush 14 An orifice passage 152 extending linearly from the fluid chamber 84 to the inside of the rod body 12 and reaching the equilibrium chamber 148 through the through hole 140 is formed.

  Therefore, in such a torque rod 120 of the present embodiment, instead of the upper and lower divided plate fittings (18, 20) in the first embodiment, the first and second divided cylindrical fittings 122, each formed of a tubular body, respectively. The rod body 12 can be configured by adopting 124, and the design flexibility can be further improved.

  Therefore, also in the torque rod 120 of the present embodiment, separately from the fluid chamber 84 formed in the main body of the first rubber bush 14, the volume variable equilibrium chamber 148, the fluid chamber 84 and the equilibrium chamber 148 are mutually connected. Each of the communicating orifice passages 152 is formed by skillfully using the rod main body 12 separately from the first rubber bushing 14 main body, while suppressing an increase in the size of the first rubber bushing 14 itself, A large enclosed volume of the incompressible fluid can be secured, and a degree of freedom in design such as a cross-sectional area and a length of the orifice passage 152 can be secured, and the same effects as in the first embodiment can be effectively exhibited. It is.

  In addition, although not enumerated one by one, the present invention can be implemented in an embodiment to which various changes, modifications, improvements, and the like are added based on the knowledge of those skilled in the art, and such an embodiment does not depart from the spirit of the present invention. It goes without saying that all are included in the scope of the present invention as long as they do not depart.

  Specifically, for example, in the above-described embodiments, the rod body has a single linearly extending longitudinal shape. However, for example, it is shown in each figure of JP-A-8-332858. As described above, the present invention is similarly applied to a connecting rod having a longitudinal shape in which one end or both ends in the longitudinal direction of the rod body are branched to be T-shaped or H-shaped as a whole. Such an embodiment is also included in the technical scope of the present invention.

In each of the above embodiments, the fluid-filled rubber bush is assembled only at one end in the longitudinal direction of the rod body 12, but any of the rubber bushes assembled at both ends in the longitudinal direction is used. Alternatively, a fluid-filled type may be employed. In that case, as one rubber bush in the longitudinal direction, a pair of fluid chambers in which relative pressure fluctuations are generated at the time of vibration input, and an orifice passage that interconnects the pair of fluid chambers are both inside. it is also possible to employ a hydraulic rubber bushing formed by comprising the conventional structure.

  Furthermore, it is possible to form a plurality of equilibrium chambers on the rod body. The equilibrium chambers are communicated with each other to substantially form one equilibrium chamber, and each equilibrium chamber can be communicated with a separate fluid chamber through a separate orifice passage. good.

  Furthermore, in the above-described embodiment, a specific example of the present invention applied to a torque rod for an automobile has been shown. However, the present invention can be applied to a suspension arm or a link rod for an automobile, or various devices other than an automobile. Needless to say, the present invention can be applied to a wide range of various anti-vibration connecting rods.

It is a longitudinal section showing a torque rod for cars as a first embodiment of the present invention. FIG. 2 is a plan view of the torque rod shown in FIG. 1. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing in FIG. It is a longitudinal cross-sectional view which shows the vulcanization molded product of the upper side division | segmentation plate metal fitting which comprises the torque rod shown by FIG. It is a longitudinal cross-sectional view which shows the vulcanization molded product of the lower side division | segmentation plate metal fitting which comprises the torque rod shown by FIG. It is a cross-sectional view which shows the bush main body which comprises the torque rod shown by FIG. It is VIII-VIII sectional drawing in FIG. It is a longitudinal cross-sectional view which shows the torque rod as 2nd embodiment of this invention. FIG. 10 is a plan view of the torque rod shown in FIG. 9. It is a longitudinal cross-sectional view which shows the torque rod as 3rd embodiment of this invention. FIG. 12 is a plan view of the torque rod shown in FIG. 11. It is a longitudinal cross-sectional view which shows the torque rod as 4th embodiment of this invention. FIG. 14 is a plan view of the torque rod shown in FIG. 13.

Explanation of symbols

10, 100, 110, 120 Torque rod 12 Rod body 14 First rubber bush 16 Second rubber bush 18 Upper divided plate metal fitting 20 Lower divided plate metal fitting 30 Upper concave groove 31 Lower concave groove 35 Central upper cylindrical portion 42 Central lower cylindrical portion 44 Fitting peripheral wall portion 46 Caulking piece 48 Upper adherend rubber elastic body 50 Lower adherend rubber elastic body 58 Upper diaphragm 67 Lower diaphragm 68 First attachment cylinder portion 69 Second outer cylinder Portion 70 Bushing body 84 Fluid chamber 86 Equilibrium chamber 88 Orifice passage 112 Lower divided metal fitting 114 Upper divided metal fitting 140 Through hole 144 Cylindrical diaphragm 148 Equilibrium chamber 152 Orifice passage

Claims (8)

Rubber bushes are assembled to both end portions of the rod body in the longitudinal direction, and both end portions of the rod body are attached to one member to be vibration-proof connected via the rubber bushes. In addition, a fluid chamber in which an incompressible fluid is sealed is formed with respect to a rubber bush assembled to at least one end of the rod body, and is prevented based on the flow action of the incompressible fluid at the time of vibration input. In the fluid-filled vibration-proof connecting rod that demonstrates the vibration effect,
An equilibrium chamber in which a volume change is allowed is formed by a part of the wall portion being made of a flexible film located at an intermediate portion in the longitudinal direction of the rod body, and the incompressible chamber is formed in the equilibrium chamber. An orifice passage for filling the fluid and communicating the equilibrium chamber with the fluid chamber is formed , and at least a part of the orifice passage is formed by utilizing a space inside the rod body. A fluid-filled vibration-proof connecting rod characterized by
  The balance chamber is formed by forming a recess or a through hole in an intermediate portion in the longitudinal direction of the rod body, and covering the opening of the recess or the through hole fluid-tightly with the flexible film. The fluid-filled vibration-proof connecting rod according to 1.   The orifice passage extends from the fluid chamber of the rubber bush to the inside of the rod body, and in the vicinity of the tip of the orifice passage extending from the fluid chamber, the peripheral wall of the orifice passage formed by the rod body 2. The fluid-filled vibration-proof connecting rod according to claim 1, wherein the through-hole penetrating the first portion is formed and the equilibrium chamber is formed by covering the through-hole with the flexible film.   The rod body is formed of divided structures that are superposed on each other in a direction substantially perpendicular to the longitudinal direction of the rod body at least in an intermediate portion in the longitudinal direction, and between the overlapping surfaces in the divided structure The fluid-filled vibration isolating connecting rod according to any one of claims 1 to 3, wherein the equilibrium chamber and the orifice passage are formed.   A seal rubber layer is formed on the overlapping surface of at least one of the divided structures, and the balance chamber and the orifice passage are formed in an external space by sandwiching the seal rubber layer between the overlapping surfaces of the divided structures. The fluid-filled vibration-proof connecting rod according to claim 4, which is fluid-tightly sealed against the fluid.   The rod main body is formed with the divided structure over the entire length in the longitudinal direction, and the outer cylinder portions to which the rubber bushes are assembled at both end portions in the longitudinal direction of the rod main body are cooperatively formed with the divided structure. The fluid-filled vibration-proof connecting rod according to claim 4.   The fluid-filled vibration-proof connecting rod according to any one of claims 1 to 6, wherein the orifice passage in the rod main body is formed to be curved or bent and extend in a non-linear shape. At least one of the divided structures is constituted by a press-molded metal member, and the equilibrium chamber is formed by using a concave portion formed by pressing so as to open on the overlapping surface of the divided structure. The fluid-filled vibration-proof connecting rod according to any one of claims 4 to 7, wherein the orifice passage is formed.

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